The total energy your solar system generates each year depends on:
- System size (in kW)
- Sunlight in your area (North West UK gets ~850–1,000 kWh per kW per year)
- Roof angle, direction, and shading
🔢 Simple Rule of Thumb
Annual Generation (kWh) = System Size (kW) × 900
(We use 900 as a UK average generation factor in kWh per kW installed)
☀️ Examples:
| System Size | Estimated Annual Output |
| 3 kW | ~2,700 kWh |
| 4 kW | ~3,600 kWh |
| 5 kW | ~4,500 kWh |
| 6 kW | ~5,400 kWh |
🧠 Bonus Tip:
A 4 kW system (around 10 panels) can cover most of the yearly usage for a typical UK family, especially if combined with smart energy use or battery storage.
